Compensation Effects of Rewatering at Flowering Stage on Leaf State and Yield Structure of Winter Wheat under Drought

doi:10.3969/j.issn.1000-6362.2020.04.007

Abstract

Abstract: In order to investigate the compensation effects of rewatering during flowering stage on leaf state and yield structure of winter wheat, four drought treatment were set during jointing-flowering stage by using winter wheat variety ‘Jimai 22’ as the test material. Before jointing stage of winter wheat, soil moisture of 20cm soil layer in each treatment should be controlled at about 60%. This experiment carried out one-time irrigation of water according to 80% (W1), 50% (W2), 25% (W3) and 0% (W4) of normal water replenishment (75mm) at jointing stage (April 2). This led winter wheat in different treatments to experience different levels of drought stress at different times. W1, W2, W3 and W4 treatments showed moderate drought, severe drought, severe drought and extreme drought at the end of water control respectively. Winter wheat with normal irrigation in the field was as control (CK, soil moisture, 65%-75%). At flowering stage (April 26), each treatment was rewatered until soil moisture reached 90%. Soil moisture of each treatment was consistent with CK before winter wheat matured. The effects of drought stress and rewatering on leaf area, leaf water content, chlorophyll content, yield and yield structure of winter wheat were investigated. The results showed that leaf water content, leaf area and chlorophyll content decreased with the increase of drought intensity. Leaf water content and leaf area in W1, W2 and W3 treatments recovered to CK levels after rewatweing. The time required for recovery was positively related to the degree of stress. The degree of recovery of chlorophyll content in those treatments decreased with the increase of stress. The compensation effect of rewatering in W4 treatment were the weakest. Compared with control, these parameters under extreme drought treatment were still significantly declined of 8.7%, 21.2% and 32.3% after rewatering, respectively. At the end of water control, only W4 treatment in the four drought treatment groups reached the extreme drought level. This indicated that extreme drought could cause irreversible damage to winter wheat leaves, and rewatering could not be recovered. Drought stress resulted in the decrease of yield and grains per spike and the increase of infertility spikelet rate. The decrease and increase were related to the degree of drought stress. Compared with control, the yield and infertility spikelet rate in each treatment group were significantly different. As for grains per spike, only W3 and W4 treatments reached significant levels, with a decrease of 20.0% and 23.3%. Rewatering after flowering, thousand grains weight of each treatment group all recovered to CK level, showing obvious compensation effects. Among the yield and yield structure, the most obvious compensation effect was thousand grains weight, and then grains per spike. The compensation effects of yield and infertility spikelet rate were the weakest.

Key words: Winter wheat, Drought, Compensation effect, Leaves, Yield structure

CLC Number:

JIANG Meng-yuan, XUE Xiao-ping, YANG Zai-qiang, ZHAO Hong, DONG Zhi-qiang, XU Yi, ZOU Jun-li. Compensation Effects of Rewatering at Flowering Stage on Leaf State and Yield Structure of Winter Wheat under Drought[J]. Chinese Journal of Agrometeorology, 2020, 41(04): 253-262.

References

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